nice refactorings

PracticeCalendar.Domain/Entities/PracticeEvent.cs

@@ -22,8 +22,7 @@ namespace PracticeCalendar.Domain.Entities
         public string Title { get; private set; } = string.Empty;
         public string Description{ get; private set; } = string.Empty;
 
-        private List<Attendee> attendees = new List<Attendee>();
-        public IEnumerable<Attendee> Attendees => attendees.AsReadOnly();
+        public IList<Attendee> Attendees { get; private set; } = new List<Attendee>();
 
         public DateTime StartTime { get; private set; }
         public DateTime EndTime { get; private set; }
@@ -32,7 +31,7 @@ namespace PracticeCalendar.Domain.Entities
         {
             Guard.Against.Null(attendee, nameof(attendee));
             attendee.AssignToEvent(this.Id);
-            attendees.Add(attendee);
+            Attendees.Add(attendee);
 
             var attendeeAddedEvent = new AttendeeAddedEvent(this, attendee);
             base.RegisterDomainEvent(attendeeAddedEvent);

PracticeCalendar.Domain/Entities/Specifications/PracticeEventsWithAttendees.cs

@@ -6,7 +6,8 @@ namespace PracticeCalendar.Domain.Entities.Specifications
     {
         public PracticeEventsWithAttendees()
         {
-            Query.Include(x => x.Attendees);
+            Query.AsNoTracking()
+                .Include(x => x.Attendees);
         }
     }
 }

PracticeCalendar.Domain/Exceptions/PracticeEventNotFound.cs

@@ -0,0 +1,8 @@
+using PracticeCalendar.Domain.Common;
+
+namespace PracticeCalendar.Domain.Exceptions
+{
+    public class PracticeEventNotFoundException : DomainException
+    {
+    }
+}